交通安全是社会关注的热点问题,安全隐患主要是超速和超载,某中学八年级数学活动小组的同学进行了测试汽车的速度的实验,如图,先在笔直的公路
旁选取一点
,在公路
上确定点
,使得
,
米,
,这时,一辆轿车在公路
上由
向
匀速驶来,测得此车从
处行驶到
处所用的时间为4秒,并测得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5814310fc082b0297b2d3c39a8bc189.png)
,求
的距离和此车的速度.(结果保留整数,参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b2e6a596589a074a2cb60d95617152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4201dcfbe181dd2a5f7b0d5131929da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afe42efc2a3b44ec62da69b86092a03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93e7c6eba439b1d17151568b7e41086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5814310fc082b0297b2d3c39a8bc189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6811cd554f1c68fe54f85482e3526a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/2e03839b-0a68-489f-9774-2d521446515e.png?resizew=226)
更新时间:2023-11-01 19:15:12
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【推荐1】如图1,在△ABC中,∠B=∠BCA,D,E是BC边上的点,连接AD、AE,将△ADE沿直线AE折叠,点D与点F对应,连接CF,若∠BAC=∠DAF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/861d31e1-9a81-40c1-9e60-6c5850b1a790.png?resizew=363)
(1)求证:△ABD≌△ACF;
(2)求证:AC平分∠BCF;
(3)如图2,若∠B=
,BD=8,CE=6,求AB的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/861d31e1-9a81-40c1-9e60-6c5850b1a790.png?resizew=363)
(1)求证:△ABD≌△ACF;
(2)求证:AC平分∠BCF;
(3)如图2,若∠B=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7755a8ad7675d65b5eede6e3f34de13f.png)
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【推荐1】如图,
是等边三角形,
是中线,延长
至E,使
.
;
(2)请用无刻度的直尺和圆规作出线段
的中点F(不写作法,保留作图痕迹);若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce25e95729c34d26e482512d36dd89b1.png)
(2)请用无刻度的直尺和圆规作出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】小明将一副三角板如图所示摆放在一起,发现只要知道其中一边的长就可以求出其他各边的长.若已知CD=
,求AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/8/5/2262042729193472/2262756353433601/STEM/00f2407baa324a7bb67a49545af4a457.png?resizew=177)
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【推荐1】(1)如图
,等腰直角
中,
,
,线段
经过点
,过A作
于点
,过
作
于
求证:
≌
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/c428f0a1-1dde-4c50-9250-19a48b6b2686.png?resizew=622)
(2)如图
,已知在平面直角坐标系
中,
为坐标原点,点
的坐标为
,点
的坐标为
,点
是平面直角坐标系中的一点,若
是以
为直角边的等腰直角三角形,求点
的坐标;
(3)如图
,已知在平面直角坐标系
中,
为坐标原点,在等腰直角
中,
,
,点
在线段
上从
向
运动
运动到点
停止
,以点
为直角顶点向右上方作等腰直角
,求点
移动的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323b786e35c9b762d00f2b2ef74ce1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c388d0a3f0a8d9fb0b9576d00af225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c60ab4cdefda079244161bb911a453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e28ce60503fab70ce1797449d90dadc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf94bbdc11e2942b20368833c7d7a787.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/c428f0a1-1dde-4c50-9250-19a48b6b2686.png?resizew=622)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1a65d88f9823d49da8f3b96ea9ec6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ec371d5dbc19d236bf8a1f084031e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32279cf0de44707705018bc58e08074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】如图,在等腰三角形
中,
,以点O为圆心画圆,
与
相切于点P,
分别与
相交于点M,N, 连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/b88babbe-827a-4a9c-9521-5fb76239e607.png?resizew=141)
(1)求证:
;
(2)若
,求扇形
(即阴影部分)的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb802b0cd77d772dceff0d9ff6c879ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419252cf580698ada7c27ecd95669f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45193c02903d8966f135678c94fd840a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/b88babbe-827a-4a9c-9521-5fb76239e607.png?resizew=141)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e9fcadb6fa121ff7897d2623d346d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e17dc84ba2e871aeb3a3fd2a2b5f1a8.png)
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【推荐1】已知:如图,△ABC中,∠BAC=90°,AB=AC,AD⊥BC,垂足是D,AE平分∠BAD,交BC于点E.CM⊥AE,垂足是F, 交AD于N,交AB于M,连接ME.
![](https://img.xkw.com/dksih/QBM/2015/1/14/1573784220131328/1573784226070528/STEM/f971517f7e0940439252863df4aae398.png)
(1)求证:ME⊥BC;
(2)若AB=
,试求ME的长.
![](https://img.xkw.com/dksih/QBM/2015/1/14/1573784220131328/1573784226070528/STEM/f971517f7e0940439252863df4aae398.png)
(1)求证:ME⊥BC;
(2)若AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f190b17530d81d927c358ac84757a4.png)
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真题
【推荐2】(11·珠海)如图,在正方形ABC1D1中,AB=1.连接AC1,
以AC1为边作第二个正方形AC1C2D2;连接AC2,以AC2为边作第三个正方形AC2C3D3.
(1)求第二个正方形AC1C2D2和第三个正方形AC2C3D3的边长;
(2)请直接写出按此规律所作的第7个正方形的边长.
以AC1为边作第二个正方形AC1C2D2;连接AC2,以AC2为边作第三个正方形AC2C3D3.
(1)求第二个正方形AC1C2D2和第三个正方形AC2C3D3的边长;
(2)请直接写出按此规律所作的第7个正方形的边长.
![](https://img.xkw.com/dksih/QBM/2011/7/29/1573230324391936/1573230354628608/STEM/75365b6d-d440-4101-a9c5-9de220e6aefe.png?resizew=168)
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【推荐3】阅读理解:我国是最早了解勾股定理的国家之一,它被记载于我国古代的数学著作《周髀算经》中,汉代数学家赵爽为了证明勾股定理,创制了一幅如图1所示的“弦图”,后人称之为“赵爽弦图”(边长为c的大正方形中放四个全等的直角三角形,两直角边长分别为a,b,斜边长为c).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/32b5ee2d-2a56-4667-a57b-c05cf3dd62a2.png?resizew=409)
(1)请根据“赵爽弦图”写出勾股定理的推理过程;
探索研究:
(2)小亮将“弦图”中的2个三角形进行了运动变换,得到图2,请利用图2证明勾股定理;
问题解决:
(3)如图2,若
,
,此时空白部分的面积为__________;
(4)如图3,将这四个直角三角形紧密地拼接,形成风车状,已知外围轮廓(实线)的周长为24,
,求该风车状图案的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/32b5ee2d-2a56-4667-a57b-c05cf3dd62a2.png?resizew=409)
(1)请根据“赵爽弦图”写出勾股定理的推理过程;
探索研究:
(2)小亮将“弦图”中的2个三角形进行了运动变换,得到图2,请利用图2证明勾股定理;
问题解决:
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019eb94a6a2b38308811470d860e1a20.png)
(4)如图3,将这四个直角三角形紧密地拼接,形成风车状,已知外围轮廓(实线)的周长为24,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef520a2657abdf14fa6818c380b596a.png)
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